Centrifugal Test on Behavior of the Dolphin Structure under Ship Collision

선박충돌 시 돌핀 구조물의 거동에 대한 원심모형실험

  • Oh, SeungTak ;
  • Bae, WooSeok ;
  • Cho, SungMin ;
  • Heo, Yol
  • 오승탁 (충북대학교 대학원 토목공학과) ;
  • 배우석 ((주)나노지오이엔씨 기술연구소) ;
  • 조성민 (한국도로공사 도로교통기술원) ;
  • 허열 (충북대학교 토목공학과)
  • Received : 2010.10.08
  • Accepted : 2010.12.07
  • Published : 2011.01.01


The impact protection system consists of an arrangement of circular sheet pile cofferdams-denoted dolphin structuredeeply embedded in the seabed, filled with crushed rock and closed at the top with a robust concrete cap. Centrifuge model tests were performed to investigation the behaviors of dolphins in this study. Total 7 quasi-model tests and 11 dynamic model tests were performed. The main experimental results can be summarized as follows. Firstly, The experimental force-displacement results for quasi-static tests show a limited influence on the initial stiffness of the structure from the change in fill density and the related change in the stiffness of the fill. And by comparing the dissipation at the same dolphin displacement it was found that the denser fill increase the dissipation by 16% for the 20m dolphin and by 23% for the 30m dolphin. The larger sensitivity for the large dolphin is explained by a larger contribution to the dissipation from strain in the fill. In low level impacts the dynamic force-response is up to 26~58% larger than the quasi-static and the dissipation response is showed larger in small displacement. Hence, it is concluded conservative to use the quasi-static response characteristics in the approximation of the response, and it is further concluded that the dolphin resistance to low level impacts is demonstrated to be equivalent and even superior to the high level impacts.


Supported by : 충북대학교


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